My dog has been unwell for four or five days; thought it ate something bad, gave gut medicine, but worse – diarrhea, vomiting yellow fluid, very yellow urine, can’t stand, legs tremble, lies all day, won’t eat even when offered, only drinks a little.

A dog unwell for four or five days should go to a vet promptly, because dogs can’t say where it hurts and unprofessional guesses and random medication can worsen and delay recovery. From your description, the many symptoms starting with not eating may be digestive or infectious disease.

After days without food then inability to stand, it may have hypoglycemia, dehydration, electrolyte imbalance, and nutritional deficiency; yellow urine and no eating could indicate secondary liver or pancreatic disease. Go to the hospital for fluid support and to find the exact cause.